Tapping-chuck.



Patented Mar. 20, 1917.

IN VE/V TOR WITNESSES Z2 1 kiffiJm ATTORNEY UNITED STATE3 FATENT @FFTQE.

JOSEPH A. DALTON, BROOKLYN, NEVJ YORK.

TAPPING-CHUCK.

Specification of Letters Patent.

Application filed February 20, 1914, Serial No. 819,927. Renewed August 8, 1916. Serial No. 113,831.

To all whom it may concern:

Be it known that 1, Josnrri A. DALTON, a citizen of the United States, resident of the borough of Brooklyn, county of Kings, city and State of New York, have invented certain new and useful Improvements in Tapping-Chucks, of which the following is a specification.-

My invention, relates to certain new and useful improvements in devices usually termed tapping chucks. The device is intended to hold and drive a screw-threading tap into and out of a suitable hole that has been drilled or otherwise produced. The objects of this invention areto provide a means for automatically checking the advancement and reversing the relative rotation of the tap after it has reached a predetermined depth in the hole. The reversal of the rotation will withdraw the tap and it may then be entered into another hole there to be operated in a manner that will be readily understood from the description, that is to follow.

The following is what I consider the best means of carrying out this invention.

The accompanying drawings form a part of this specification, in which:

Figure 1 shows in elevation partly in section the completed device ready for use.

Fig. 2 shows in plan the arrangement of certain of the gears.

Fig. 3 shows a detail of the main shaft.

Similar reference numerals indicate like parts in all the figures where they appear.

The main driving shaft is shown at 1 and. the upper end of this shaft may be'tapered as shown at 2 so that it may enter the spindle of any suitable drill press or other machine. A bearing is formed in this shaft which passes through a suitably arranged hole in a lug 3 formed in the casing that I have supplied for my device, and upon the lug 3 and the shaft 1, I provide a ball thrust bearing as indicated at 5. To the lower end of the shaft 1, I secure a gear 6, which may have formed integral or secured thereto a portion of a clutch 7 A countershaft 8 secured in the casing has rotatably mounted thereon a cylinder 9 provided with two cut gears 10 and 11 of different diameters. The gear 10 is in mesh with the gear 6 and in mesh with the gear 11. I arrange another cut-gear 12 which runs free on a short shaft 12 extending into the casing, the cut-gear 12 meshes with the larger gear 12 mounted upon the short shaft 13 which extends through a lug 14 formed in the easing. The lower end of the shaft 13 may be tapered to receive any suitable chuck 16 into which is secured the tap 17 Secured to or formed integral with the gear 12 is a portion of a chuck as shown at 18, and feathered upon the upper end of the shaft 13 is an intermediate portion of the clutch as shown at 19. This intermediate portion may be reciprocated upon the shaft 13 so that it will engage either of the clutch members 7 or 18, but I have so proportioned my parts that both of the clutch members 7 and 18 cannot be engaged at one time. As the gear G is driven'in one direction, when the clutch is engaged as shown the tap 6 will be rotated in the direction in which the gear 6 and shaft 1 rotates. When however the clutch 19 is moved downward to engage the clutch member 18 the gear 6 driving through the cylinder 9 and gears mounted thereon will rotate the tap in the opposite direction.

For reciprocating the clutch member 19 I provide a spanner 20 having opposed pins 21 which enter the recess 22 in the clutch 19. This spanner 20 is secured into a guide 21 mounted upon the pin 22 which extends quite through the casing of my device. A spring 23 arranged within the casing and between the guide 21 and the nearest adjacent surface of the casing urges the guide downward. This guide is however provided with a projection 24 which is engaged by a projection 25, on a pivoted lever 26. This lever which is pivoted in the casing has arranged at its outer end a knob or handle 28 by means of which the lever may be operated. A spring 29 urges the lower end of the lever 26 inward so that it may readily engage with the projection 2 1 of the guide 21.

The lower end of the lever 26 is tapered as shown at 30 and adjacent thereto I pro- Vide a hook 31 which passes through a perforation 32 in the side of the casing and is engaged at its outer end into another cylindrical guide member 33. Passing through this guide member 33 is a rod 34 inturned at its lowermost end as shown at 35 and this inturned end may be perforated as shown at 36 to allow the tap to pass therethrough. The rod 34 is adjustable in the guide 33 by means of a screw 37 and it may be. set so that the tap will travel downward only to a desirable extent at which time the inturned end of the rod 3 1 will engage the work or some conveniently arranged stop which will force the rod 34 and hook 31 upward causing the hook to engage the taperedend 30 of the lever 26 resulting'in'the.

withdrawal of the lower end of the lever 26 disengaging it from the projection 24. and allowing the guide 21 to be forced downward by gravity or the spring 23. This motion will cause the clutch member 19 to be released from the clutch member 7 and to engage the clutch member 18 with the result that the rotation of the tap will be reversed and the tap withdrawn. a

7 When ready for another operation the tap may be caused to rotate in the proper direction by a slight pressure upon the knob or handle 38 which will cause the'collar 39 to lift the guide 21 and the parts connected therewith so that the projection 24 on the guide 21 may again be engaged and temporarily held by the projection 25 upon the lever 26. It will be understood that when the tap is withdrawn the rod 34 and hook K 31 will drop to their full extent and the lever 26 will be by its spring 29.

. I have shown a simple means for alining the shafts 1 and 13 without connecting them together, but any other means may be employed for accomplishing this desirable result, and other modifications may be made placed in operative position Within the scope of the appended claims without departing from the principle or sacrificing the advantages of this invention. 'Having carefully and fully described my invention what I claim and desire to secure.

by Letters Patent is: V

1'. A' tapping chuck comprising a plurality of clutch members adapted to be rotated in opposite directions, an intermediate member adapted to be engaged with either setting said guide for the purpose set forth.

Signed at New York city, in the county of New'York and State of New York, this 7 10th day of February, 1914.

J. A. DALTON.

Witnesses V G. E. STERRITTE,

ARTHUR PHELPS MARR.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents.

Washington, D. G. 

